However, my significant other is working on a physics PhD and everything she does is in C or C++ with CERN ROOT. I used to use Matlab, and she thought it was adorably weak. I get a little more respect using Python now at least.
There are of course the C/C++/FORTRAN gurus that write LAPACK/BLAS/OpenCV etc. , but they're kinda in their own world. MATLAB is the de-facto wrapper for these libraries, and all prototyping is done in it.
What I'm working on needs to interface with many different existing modeling and optimization efforts at some point, and of the options out there Python seems to be the most understood by the largest group of people (statisticians/scientists/programmers). With python we can keep everything 100% open and available to the largest number of people.